Why do governments and rebel groups employ child soldiers in some internal armed conflicts but not in others? While previous studies have examined aspects of the causes and consequences of child soldier usage, to date there has never been a comprehensive empirical analysis that has examined...

Why do governments and rebel groups employ child soldiers in some internal armed conflicts but not in others? While previous studies have examined aspects of the causes and consequences of child soldier usage, to date there has never been a comprehensive empirical analysis that has examined...

Powerful countries like the United States regularly employ economic sanctions as a tool for promoting their foreign policy interests. Yet this foreign policy tool has an uninspiring track record of success, with economic sanctions achieving their goals less than a third of the time they are...

To what extent have space and ballistic missile capabilities proliferated globally and what impact have they had on global politics? To date, scholars have lacked a comprehensive data source on states' global space capabilities and only limited data on their ballistic missile arsenals. The...

While space capabilities were once concentrated among a handful of leading powers, an increasingly large number of states have gained access to them. As of 2007, 58 countries possessed dedicated civil space programs, 44 countries had placed nationally-owned satellites into orbit, and 9 countries...